For some reason my last post didn’t send/save!
I changed the pivot after I’d sent you the FBX, however I’d centred it to all vertices to the centre of the chassis. Didn’t think to put it where the wheels would come in contact with the ground.
It seems to have sorted the collision issue, however my car is now driving sideways (or so the game thinks it should!) I know it’s probably a simple fix, or likely down to me rotating the car in 3DS Max before, but If it’s a simple solution It’d be great to know, otherwise I’ll do some digging in the settings.
But hey, it’s not spazzing out or falling through the floor now, so it was definitely that which was the issue.
Updated FBX (if it helps at all): futotest.FBX | Solidfiles